🔐
JWT Decoder
Decode JWT tokens fast — header, payload, and claims (iat/exp/nbf) shown human-readable. Runs 100% in your browser, token never leaves your device.
⚡ Decode 100% trong trình duyệt
Header
Payload
What is a JWT?
A JSON Web Token is the standard format for transmitting claims between client and server (auth, API access). Three parts:
<header>.<payload>.<signature>Security note
- This tool only decodes — it does NOT verify the signature. The payload is shown even if the signature is invalid.
- Never paste production JWTs containing sensitive data into any online decoder — including this one. Use dev/test tokens.
- Decoding runs 100% in your browser. Disconnect from the internet → it still works.
Related
Related tools
See all tools →NEW
🎨
JSON Formatter
Format / minify / validate JSON. Sort keys A-Z, custom indent, Ctrl+Enter shortcut.
NEW🔍
Regex Tester
Test regex live with match highlighting. 7 ready presets including Vietnamese.
NEW🔑
UUID / Hash / Base64 / URL
Bundle: UUID v4, SHA-256/512 hash, Base64 (URL-safe), URL encode.
NEW🔤
Remove Vietnamese diacritics
Strip diacritics for slugs, filenames, usernames, identifiers. Optional đ → d.